Radial metallicity profiles of individual sources have been in fact investigated by many authors using either XMM-Newton, Chandra, or Suzaku [1]}. This is the case for systems such as NGC 5044 [2]}, [3]}, RX J1159+5531 [4]}, [5]}, AMW 4 [6]}, HCG 62 [7]}, [3]}, [9]}, [10]}, MKW 4 [11]}, [3]}, NGC 1399 [13]}, [14]}, [15]}, and UGC 03957 [16]}.
